Security fix: Refactor instantiation of Snakeyaml and prepare update to Snakeyaml 2.0

This is a change in order to be prepared for upcoming updates in SpringBoot, which will use Snakeyaml version 2.0!

Follow Section, “Security fix: Refactor instantiation of Snakeyaml and prepare update to Snakeyaml 2.0” for upgrade information.

(CMS-22895)